Add RubyConf India 2025

Author: marcoroth

_data/conferences.yml

@@ -3160,6 +3160,17 @@
   url: https://rubyconf.at
   announced_on: 2025-03-12
 
+- name: RubyConf India 2025
+  location: Jaipur, India
+  start_date: 2025-09-12
+  end_date: 2025-09-13
+  url: https://rubyconf.in
+  twitter: rubyconfindia
+  cfp_open_date: 2025-05-22
+  cfp_close_date: 2025-07-15
+  cfp_link: https://www.papercall.io/rubyconf-india-2025
+  announced_on: 2025-05-22
+
 - name: Helvetic Ruby 2026
   location: Switzerland # TODO: update once location is confirmed
   start_date: 2026-12-31 # TODO: update once dates are confirmed